The Senate rules say that they will begin action on impeachment
when the House presents their findings to the Senate.
—
Maybe such a rule currently in the senate but not so written in the constitution, which only says the senate alone decides trial rules.
Nothing in the Constitution says anything about the need for the house to “present their findings”.
I repeat:
The Constitution allows the Senate to set it’s own rules.
The Senate rules say that they will begin action on impeachment
when the House presents their findings to the Senate.
I can explain it to you,
but I can’t understand it for you.